Complex RPN Calculator vs |RPN| Scientific Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Complex RPN Calculator
This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.
- Complex number support
- Four-level stack
- Polar and rectangular formats
- State persistence
- 10 memory locations
- Scientific calculations
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Complex RPN Calculator is a scientific RPN calculator with a four stack whose native number is complex. You can view and enter numbers in both polar and rectangular formats. Complex RPN remembers its state between usages and has 10 memory locations.
|RPN| Scientific Calculator
This calculator app uses Reverse Polish Notation for powerful calculations. It offers customizable color schemes, layouts, and online help, designed for flexibility and usability. All features are unlocked with a one-time purchase.
- Reverse Polish Notation (RPN)
- Viewable stack
- Selectable portrait/landscape layouts
- Customizable color schemes
- Online visual help
- No ads or in-app purchases
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|RPN| Scientific Calculator is a calculator which features a variety of color schemes and layouts. It utilizes Reverse Polish Notation, a viewable stack, selectable portrait and landscape layouts, online visual help and many more. The application is meant to be as flexible and powerful as possible, without sacrificing usability. |RPN| does not have ads, and never will, nor does it use in-app purchases. All functionality comes with the purchase. Here is a youtube playlist with some helpful videos: https://www.youtube.com/playlist?list=PLucgGVHO2sKhnnNf1gapHS4Zy7u69VGAs
Screenshots
Verdict
The clearest difference is price: Complex RPN Calculator at Free against |RPN| Scientific Calculator's $0.99. Complex RPN Calculator also leads on rating (3.9 vs 2.3) and ratings volume (24 vs 3). |RPN| Scientific Calculator's advantage is update cadence (fortnightly vs every 5 months) and review sentiment (60% vs 52%). On ads, in-app purchases and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Complex RPN Calculator is free to download; |RPN| Scientific Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Complex RPN Calculator holds the better App Store score, 3.9 against 2.3. That said, the two scores are not equally well evidenced: Complex RPN Calculator has 24 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 52% of Complex RPN Calculator's written reviews are positive against 60% of |RPN| Scientific Calculator's, so the app with the better star average is not the one people write more warmly about.
Complex RPN Calculator ships an update every 5 months, |RPN| Scientific Calculator fortnightly. The most recent releases landed on October 31, 2026 and November 2, 2026 respectively.
| Parameter | Complex RPN Calculator | |RPN| Scientific Calculator |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 3.9 (24 ratings) — better | 2.3 (3 ratings) |
| Positive reviews | 51.7% of reviews | 60.0% of reviews — better |
| Number of ratings | 24 — better | 3 |
| Update frequency | Every 5 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 16.4 | 16 — better |
| Further details — not scored | ||
| Size | 1 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | John Coddington | Bradley Smith |
Customer experience
Complex RPN Calculator
|RPN| Scientific Calculator
Bugs and requests
Complex RPN Calculator
Reported bugs
6 issues- Mutes other apps when used
- Slow keyboard response after update
- X^3 calculation incorrect for large imaginary numbers
- App crashes on opening/button press (historical iOS 9 issues)
- App starts upside down in landscape on iPad (historical iOS 8 issue)
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- Unreadable fonts on iPad (historical version 1.2 issue)
Requested features
24 requests- Turn off key click sound
- Customize number display
- See the stack
- Fix slow entry response
- Fix imaginary number calculation (X^3)
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- Improve SwiftUI design (less whitespace)
- Show all stack levels
- Add angle function
- Add magnitude function
- Add 'Clear X' button
- Make RAD/DEG toggle button
- Single button for Sci/Eng/Fix/Raw modes
- Add '//' (parallel) function
- Add 'Module' button
- Change 'i' to 'j' for imaginary part
- Show stack levels
- Add log2 function
- Add logGamma function
- Smaller buttons
- Add complex conjugate button
- Add real part button
- Add imaginary part button
- Add modulo function
- Make app start faster
|RPN| Scientific Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Complex RPN Calculator
No in-app purchases
|RPN| Scientific Calculator
No in-app purchases
Questions
Is Complex RPN Calculator free?
Is |RPN| Scientific Calculator free?
Which has better reviews, Complex RPN Calculator or |RPN| Scientific Calculator?
Do Complex RPN Calculator or |RPN| Scientific Calculator have ads?
Which is updated more often, Complex RPN Calculator or |RPN| Scientific Calculator?
Other comparisons
